A high temperature expansion multiple testing device for fireproof expansion seal

Abstract

The application discloses a kind of high-temperature expansion multiple testing devices of fireproof expansion seal, belong to material performance testing equipment technical field, including furnace body, hinged in the furnace body outer wall furnace door, be set in the furnace hearth of furnace body and with the control box body being connected to furnace body, still include: rack, first linkage component being connected between furnace door and moving frame body, swing loose mechanism, prevent dispersing board and second linkage component being connected between furnace door and prevent dispersing board;The application realizes the automatic in-out of furnace and safety isolation of sample by the mechanical linkage of furnace door and rack, prevent dispersing component, avoids the risk of manual high-temperature material taking and placing, reduces the heat loss when furnace door is opened;Sample is loosened in advance using mechanical shaking in the process of moving out, reduces the artificial error of post-processing;Combined with air curtain barrier and prevent dispersing board sealing, effectively inhibit high-temperature flue gas overflow, improve the safety of test environment and data accuracy.

Description

Technical Field

[0001] This invention relates to the field of material performance testing equipment, and in particular to a device for testing the high-temperature expansion ratio of fire-resistant expansion seals. Background Technology

[0002] The high-temperature expansion ratio of fire-resistant expansion seals is an important indicator for evaluating their fire-resistant expansion performance. In existing testing procedures, the sample to be tested is usually weighed and placed in a crucible, which is then placed in a preheated resistance furnace for heat preservation. After the heat preservation is completed, the crucible is removed from the furnace, and the sample is allowed to cool before being loosened, sieved, and its volume is measured to calculate the expansion ratio of the sample.

[0003] The existing operating procedures described above reveal several technical defects: First, most existing resistance furnaces use a fixed furnace chamber structure, requiring the furnace door to be opened and tools such as pliers to be used to place or remove the crucibles. Due to the high temperature in the furnace chamber, manual handling presents problems such as strong heat radiation, limited operating space, and the crucibles being prone to shaking or tilting. Furthermore, when the furnace door is open for an extended period, air convection inside and outside the furnace chamber intensifies, easily causing temperature fluctuations and the escape of high-temperature gases, affecting the stability of the testing environment. Second, the sample structure after high-temperature expansion is loose and fragile; the methods of manual breaking up and sieving vary from person to person, leading to inconsistent particle packing density, which becomes a major source of error in volume measurement. Finally, the disorderly escape of high-temperature flue gas when the furnace door is open wastes heat energy and worsens the working environment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a high-temperature expansion ratio testing device for fireproof expansion seals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature expansion ratio testing device for fire-resistant expansion seals includes a furnace body, a furnace door hinged to the outer wall of the furnace body, a furnace chamber disposed within the furnace body, and a control box connected to the furnace body, and further includes: A placement rack is slidably disposed at the bottom of the furnace chamber, the placement rack comprising a movable frame and a crucible cylinder movably supported on the movable frame; The first linkage component is connected between the furnace door and the movable frame. It is used to drive the movable frame to slide from the heating position inside the furnace to the pick-up and put-down position outside the furnace when the furnace door is opened, and to drive the movable frame to reset when the furnace door is closed. The swinging loosening mechanism is set between the crucible cylinder and the furnace chamber, and is used to drive the crucible cylinder to swing and reset when the moving frame slides. in, An anti-escape plate is slidably installed inside the furnace; The second linkage component is connected between the furnace door and the anti-escape plate. It is used to move the anti-escape plate from the position of avoiding heating to the closed position during the opening of the furnace door, so as to isolate the airflow between the inside of the furnace and the outside of the furnace body when the placement rack is in the pick-up and put-down position.

[0006] Preferably, the furnace door includes a door body and a sealing block fixed inside the door body and matching the furnace opening, wherein both the sealing block and the furnace are made of fireproof bricks; A locking assembly is provided between the furnace door and the furnace body. The locking assembly includes a U-shaped plate fixed to the furnace door, a slide rod slidably connected inside the U-shaped plate, a handle connected to one end of the slide rod, a baffle connected to the other end of the slide rod, a first elastic element sleeved on the outside of the slide rod and abutting against the handle and the U-shaped plate at both ends respectively, and a limiting plate fixed on the outside of the furnace body opening and moving against the baffle.

[0007] Preferably, the first linkage component includes a first connecting plate and a second connecting plate, one end of the first connecting plate is rotatably connected to the furnace door, the other end of the first connecting plate is rotatably connected to one end of the second connecting plate, and the end of the second connecting plate away from the first connecting plate is rotatably connected to the placement rack.

[0008] Preferably, the top of the movable frame is provided with a conical groove, and the crucible cylinder is movably supported in the conical groove by a connecting ball; The swing loosening mechanism includes a force-bearing rod, a counterweight, and a stop bar; the force-bearing rod is connected below the connecting ball, and the counterweight is located on one side of the bottom of the crucible tube so that the crucible tube abuts against the inner wall of the conical groove when not pushed by the stop bar.

[0009] Preferably, there are multiple stop bars, which are spaced apart at the bottom of the furnace along the sliding direction of the movable frame, so that the force-bearing rod abuts against the multiple stop bars in sequence during the sliding process of the movable frame; When the movable frame slides, the force-bearing rod abuts against the stop rod and causes the crucible cylinder to swing. After the force-bearing rod disengages from the stop rod, the counterweight drives the crucible cylinder to return to its original position.

[0010] Preferably, the second linkage component includes a third connecting plate, a fourth connecting plate, and a shrink-fit connection part. One end of the third connecting plate is rotatably connected to the furnace door, and the other end of the third connecting plate is rotatably connected to the fourth connecting plate. A shrink-fit connection part is connected between the fourth connecting plate and the anti-escape plate. The retractable connection includes ball joint components connected to the anti-escape plate and the fourth connecting plate respectively, and a telescopic rod connected between the two ball joint components, to compensate for the angle and distance changes between the anti-escape plate and the fourth connecting plate during the sliding process.

[0011] Preferably, a fixed rod is provided inside the furnace, and a sliding groove is provided on the anti-escape plate to slide and engage with the fixed rod, so that the anti-escape plate can reciprocate along the fixed rod between the heat avoidance position and the closed position.

[0012] Preferably, the anti-escape plate has multiple grooves, and each groove is connected to a flip plate via a rotating shaft, the rotating shaft being offset from the center of the width of the flip plate; A lifting rod is connected below the flipping plate. When the anti-escape plate moves to the closed position, the lifting rod abuts against the bottom of the furnace and pushes the flipping plate to rotate to the closed groove position. When the anti-escape plate returns to the position to avoid heating, the lifting rod disengages from the bottom of the furnace, and the flipping plate rotates to the open groove position under its own weight.

[0013] Preferably, an auxiliary heat preservation component is provided on the outer wall of the furnace body below the furnace opening. The auxiliary heat preservation component includes a pneumatic shell fixed on the outer side of the furnace body. A partition for dividing the internal cavity of the pneumatic shell into a gas collecting chamber and a gas venting chamber is fixed inside the pneumatic shell. A piston plate is slidably connected inside the gas collecting chamber. A second elastic element is provided between the piston plate and the inner wall of the gas collecting chamber. A traction rope is fixed on one side of the piston plate. The end of the traction rope away from the piston plate passes through the pneumatic shell and is fixedly connected to the furnace door. The top plate of the gas venting chamber has several vent holes that are inclined towards the furnace opening. The furnace body is equipped with one-way air inlet valves at both the gas collecting chamber and the gas exhaust chamber to control the directional flow of gas.

[0014] Preferably, the placement rack, the anti-escape plate, and each component in the first linkage assembly and the second linkage assembly are made of high-temperature resistant materials.

[0015] Compared with the prior art, the present invention provides a high-temperature expansion ratio testing device for fire-resistant expansion seals, which has the following beneficial effects: 1. In this invention, the opening and closing of the furnace door and the sliding movement of the placement rack are combined through the first linkage component, realizing the automatic switching between the heating position of the crucible cylinder inside the furnace and the placement position outside the furnace. The operator only needs to open and close the furnace door to complete the placement and removal of samples in a safe area outside the furnace body. This completely avoids the risk of burns and sample drop caused by the traditional long-handled clamps being inserted into the high-temperature furnace chamber. It greatly reduces the difficulty of operation and labor intensity, and realizes a safe operation mode of human-machine isolation.

[0016] 2. In this invention, the anti-escape plate and the auxiliary insulation component work together through the second linkage component. At the moment the furnace door is opened, the anti-escape plate slides and flips rapidly to form a physical barrier. At the same time, the traction rope pulls the piston plate to spray external air obliquely through the exhaust hole to form an air curtain. This dual barrier mechanism effectively suppresses the convection of air inside and outside the furnace, greatly shortens the furnace door opening time, significantly reduces the escape of high-temperature hot air and the backflow of cold air, and ensures the stability of the constant temperature environment at high temperature inside the furnace, thereby ensuring the accuracy of the expansion ratio test data.

[0017] 3. In this invention, by utilizing the contact between the bottom force rod of the connecting ball and the fixed stop rod inside the furnace during the retraction of the placement frame, and under the gravitational torque of the counterweight, the crucible cylinder will generate periodic oscillation and shaking during the process of moving out of the furnace. This mechanical action can initially mechanically disperse the hard, expanded agglomerates formed by high-temperature sintering in the early stage of sample cooling, effectively replacing the randomness of traditional manual knocking and breaking, ensuring the uniformity of sample particles, and significantly reducing human error in subsequent sieving and volume measurement.

[0018] 4. In this invention, when the anti-escape plate moves back to the top of the furnace, the flipping plate on it automatically flips and opens the groove under the action of gravity, avoiding blocking the heat radiation from the top of the furnace and ensuring heating efficiency. After the furnace door is opened, the flipping plate flips and closes under the action of the lifting rod, forming a complete sealing baffle. At the same time, the crucible cylinder is movably connected to the moving frame through the connecting ball, and with the reset design of the conical groove and the counterweight, it ensures adaptive leveling and stable reset during vibration and movement, improving the operational reliability and durability of the overall mechanical structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure; Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure; Figure 6 for Figure 5 Enlarged structural diagram of section B in the middle; Figure 7 This is a schematic diagram of the furnace door structure of the present invention; Figure 8 This is a schematic diagram of the structure of the placement rack of the present invention; Figure 9 This is a schematic diagram of the structure of the anti-escape component of the present invention; Figure 10 This is a schematic diagram of the structure of the flip plate of the present invention when it is flipped. Figure 11 This is a cross-sectional structural diagram of the pneumatic housing of the present invention; Figure 12 This is a schematic diagram of the exploded structure of the furnace body of the present invention; Figure 13 This is an exploded view of the first linkage component and the placement rack of the present invention; Figure 14 for Figure 11 Enlarged structural diagram of section C.

[0020] In the diagram: 1. Furnace body; 2. Furnace door; 201. Door body; 202. Sealing block; 3. Furnace chamber; 301. Baffle bar; 302. Fixing bar; 4. Placement rack; 401. Movable rack; 402. Crucible cylinder; 4021. Force-bearing bar; 403. Connecting ball; 5. Control box; 6. U-shaped plate; 601. Sliding rod; 602. Handle; 603. Baffle plate; 604. First elastic element; 605. Limiting plate; 7. First connecting plate; 701. 8. Second connecting plate; 9. Counterweight; 10. Third connecting plate; 11. Fourth connecting plate; 12. Retractable connection; 13. Ball joint component; 14. Telescopic rod; 15. Anti-escape plate; 16. Sliding groove; 17. Groove; 18. Tilting plate; 19. Lifting rod; 20. Pneumatic housing; 10. Partition plate; 11. Piston plate; 12. Second elastic element; 12. Traction rope; 12. Exhaust port; 12. One-way air intake valve. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] like Figures 1 to 14As shown, this embodiment proposes a high-temperature expansion ratio testing device for fireproof expansion seals, including a furnace body 1, a furnace door 2 hinged to the outer wall of the furnace body 1, a furnace chamber 3 installed in the central part of the furnace body 1, a placement rack 4 slidably installed at the bottom of the inner side of the furnace chamber 3, an anti-escape plate 10 installed at the top of the inner side of the furnace chamber 3, a first linkage component for connecting the placement rack 4 to the furnace door 2, a second linkage component for connecting the anti-escape plate 10 to the furnace door 2, and a control box 5 installed on the outside of the furnace body 1 and electrically connected to the furnace body 1. The control box 5 is equipped with a display, an ammeter, a heat dissipation vent, and a power switch, etc. In this embodiment, the furnace chamber 3 is used to heat the fireproof expansion seal to be tested at high temperature; the placement rack 4 is used to carry the sample to be tested and slide and transport it between the inside and outside of the furnace chamber 3; the anti-escape plate 10 is used to isolate the air exchange between the inside of the furnace chamber 3 and the outside of the furnace body 1 when the placement rack 4 delivers the material, thereby reducing the escape of high temperature gas during the opening of the furnace door 2; the control box 5 is used to control the heating process of the furnace body 1.

[0024] Specifically, furnace door 2 is closed, placement rack 4 is located in the heating position inside furnace chamber 3, and anti-escape plate 10 is located on the top inner side of furnace chamber 3, maintaining a closed or semi-closed state. Control box 5 is in standby mode. When the operator opens furnace door 2, the rotation of furnace door 2 drives placement rack 4 to slide out from the bottom of furnace chamber 3 to the outside of furnace body 1 through the first linkage component, so that the sample to be tested can be picked up and placed in a safe area outside the furnace. The operator does not need to put their hands or tools into the high-temperature furnace chamber 3 to complete the loading and unloading, reducing the risk of the operator directly contacting the high-temperature area. At the same time, through the second linkage component, the rotation of furnace door 2 drives anti-escape plate 10 to move from the top of furnace chamber 3 to a preset position, forming a temporary partition at the opening of furnace chamber 3, suppressing the outward escape of hot air from the furnace, reducing the outward escape of high-temperature hot air when furnace door 2 is opened, reducing heat loss, and improving the operating environment. This helps to maintain the relative stability of the internal temperature field of furnace chamber 3 during the loading and unloading process, providing convenience for subsequent continuous testing or rapid recovery of testing conditions. The operator can then place the crucible cup containing the fire-resistant expansion seal to be tested on the placement rack 4 outside the furnace body 1. The furnace door 2 is then closed, and the first linkage component drives the placement rack 4 to slide in the reverse direction, sending the container containing the sample into the heating position inside the furnace chamber 3. The second linkage component drives the anti-escape plate 10 to return to the top of the inner side of the furnace chamber 3 to restore the normal heating state of the furnace chamber 3. The operator then locks the furnace door 2 using the locking component and starts the furnace body 1 for high-temperature testing via the control box 5. It should be noted that, because the furnace chamber 3 is a high-temperature environment, all working parts inside the furnace chamber 3, including the placement rack 4, the anti-escape plate 10, and all components in the first and second linkage components, are made of high-temperature resistant materials. For example, the furnace chamber 3 is made of refractory material, the pin is made of high-temperature alloy, and the seal is made of ceramic fiber / graphite material. The entire device can achieve coordinated action by driving the placement rack 4 and the anti-escape component through two sets of linkage components with only the single opening and closing action of the furnace door 2. No additional independent power source or complex electrical control system is required. The mechanical linkage structure is simple and reliable, the action response is timely, the failure rate is low, and it is easy to maintain.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, in a preferred embodiment, based on the above method, the furnace door 2 further includes a door body 201 and a sealing block 202 fixed inside the door body 201 and cooperating with the opening of the furnace chamber 3. Both the sealing block 202 and the furnace chamber 3 are made of fireproof brick material, which ensures the structural stability and heat insulation performance in the high-temperature working environment. A locking assembly is provided between the furnace door 2 and the furnace body 1. The locking assembly includes a U-shaped plate 6 fixed on the furnace door 2, a slide rod 601 slidably connected in the U-shaped plate 6, a handle 602 and a baffle 603 connected to both ends of the slide rod 601, a first elastic element 604 sleeved on the outside of the slide rod 601 and abutting against the handle 602 and the U-shaped plate 6 at both ends respectively, and a limiting plate 605 fixed on the outside of the opening of the furnace body 1 and moving against the baffle 603. When the furnace door 2 needs to be closed for heating testing, the operator holds the handle 602 and rotates it to move the baffle 603 away from the limiting area of ​​the limiting plate 605, thus realizing the quick manual locking and unlocking of the furnace door 2. The pre-tightening force provided by the first elastic element 604 ensures that the baffle 603 and the furnace body 1 or the limiting plate 605 can maintain reliable contact under various working conditions, preventing the furnace door 2 from opening due to accidents or vibrations, and ensuring the safety of the testing process. It should be noted that other buckles or locks can also be used to lock the furnace door 2 and the furnace body 1.

[0026] like Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, in a preferred embodiment, based on the above method, the first linkage component further includes a first connecting plate 7 rotatably connected to the furnace door 2 via a pin and a second connecting plate 701 rotatably connected to the first connecting plate 7 via a pin. The end of the second connecting plate 701 away from the first connecting plate 7 is rotatably connected to the placement rack 4 via a pin. The placement rack 4 includes a movable frame 401 slidably connected inside the furnace chamber 3, and a crucible cylinder 402 movable on the top of the movable frame 401 via a connecting ball 403. The end of the second connecting plate 701 away from the first connecting plate 7 is movably connected to the movable frame 401. The shell of the crucible cylinder 402 is in the form of a mesh cylinder to avoid obstructing heating and ensure effective heat transfer.

[0027] Specifically, when materials need to be retrieved or placed outside the furnace, the operator opens the furnace door 2, which rotates outward around its hinge axis. During this process, the rotation of the furnace door 2 drives the first connecting plate 7 to rotate via a pin. The first connecting plate 7 then drives the second connecting plate 701 to move via the pin. The other end of the second connecting plate 701 pulls the placement rack 4 via a pin, causing it to slide in a straight line from the bottom of the inner side of the furnace chamber 3 towards the outside of the furnace body 1, thereby sending the placement rack 4 and the materials out to a convenient location outside the furnace. After the material retrieval or placement is completed, the operator closes the furnace door 2, which rotates inward around its hinge axis. At this time, the first connecting plate 7 and the second connecting plate 701 move in the opposite direction to when they are open, connected by the aforementioned pin. 1. The placement rack 4 is pushed by a pin, causing it to slide in a straight line from the bottom of the furnace chamber 3 into the furnace chamber 3 until it returns to the heating position inside the furnace chamber 3, awaiting subsequent heating operations. This mechanism requires no additional power source or complex electrical control system. It uses only the single action of opening and closing the furnace door 2 to precisely drive the placement rack 4 to complete the feeding and discharging actions through the geometric relationship of the connecting rods. The structure is simple, the failure rate is low, and it is easy to maintain. Operators only need to focus on opening and closing the furnace door 2 to simultaneously complete the feeding and discharging actions of the placement rack 4. No additional operation steps are required to drive the placement rack 4, simplifying the testing process, reducing operational complexity, and avoiding direct contact between personnel and high-temperature areas, thus improving operational safety and convenience. When the furnace door 2 is opened, the rotation of the furnace door 2 drives the first connecting plate 7 to rotate. The first connecting plate 7 further drives the second connecting plate 701 to move, thereby driving the moving frame 401 to slide along the bottom of the furnace chamber 3 towards the outside of the furnace body 1, so that the crucible cylinder 402 moves out of the furnace chamber 3, facilitating sample handling by the operator. When the furnace door 2 is closed, the above-mentioned linkage is reversed, and the moving frame 401 returns to the interior of the furnace chamber 3.

[0028] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, in a preferred embodiment, based on the above method, the swing loosening mechanism further includes a force-bearing rod 4021, a counterweight 8, and a stop bar 301. The force-bearing rod 4021 is fixed at the bottom of the connecting ball 403, and the stop bar 301, which moves against the force-bearing rod 4021, is fixed on the bottom inner wall of the furnace 3 through a connecting plate. The movable connection method of the connecting ball 403 can adapt to certain thermal expansion and contraction and mechanical impact. The top of the movable frame 401 is provided with a conical groove for the movement of the crucible cylinder 402, which is used to accommodate the crucible cylinder 402 and provide it with movement space. A counterweight 8 is provided on one side of the bottom of the crucible cylinder 402, which is used to ensure that the crucible cylinder 402 is always in contact with the inner wall of the conical groove under the action of the counterweight 8 when no force is applied, so as to maintain its stability during movement. Specifically, when the first linkage component drives the movable frame 401 to slide along the bottom of the furnace 3, whether feeding or discharging materials, the movable frame 401 moves the crucible cylinder 402 at its top together. During this process, the force-bearing rod 4021 at the bottom of the connecting ball 403 moves synchronously with the movable frame 401. When the force-bearing rod 4021 moves to meet the stop bar 301 at the bottom of the furnace 3, the stop bar 301 will apply a lateral thrust to the force-bearing rod 4021. Under the action of the lateral thrust, through the rotational connection of the connecting ball 403, the crucible cylinder 402 will swing relative to the movable frame 401. When the force-bearing rod 4021 passes the stop bar... After step 301, the external force acting on the force-bearing rod 4021 disappears. At this time, under the gravitational torque of the counterweight 8, the crucible cylinder 402 rotates around the connecting ball 403 to the other side until the crucible cylinder 402 comes into contact with the inner wall of the conical groove again and returns to a stable state. This process occurs multiple times during the movement of the placement rack 4, causing the crucible cylinder 402 to oscillate periodically. This oscillation can initially mechanically disperse and shake the agglomerated material formed in the crucible cup container placed in the crucible cylinder 402 after high-temperature expansion, effectively replacing some manual post-processing steps and reducing the uneven sample dispersion and measurement errors caused by different manual operation techniques.

[0029] like Figure 2 , Figure 3 , Figure 5 and Figure 9 As shown, in a preferred embodiment, based on the above method, the second linkage component further includes a third connecting plate 9 rotatably connected to the furnace door 2 via a pin, a fourth connecting plate 901 rotatably connected to the third connecting plate 9 via a pin, and a shrinkable connecting part 902 for connecting the fourth connecting plate 901 and the anti-escape component. The anti-escape assembly includes a fixed rod 302 fixed on both sides inside the furnace 3 and an anti-escape plate 10 slidably connected to the outside of the fixed rod 302, so that the anti-escape plate 10 can slide back and forth along the length of the fixed rod 302. The end of the retractable connecting part 902 away from the fourth connecting plate 901 is connected to the anti-escape plate 10. The side wall of the anti-escape plate 10 is provided with a sliding groove 1001 that cooperates with the fixed rod 302. Furthermore, the retractable connection 902 includes a ball joint component 9021 respectively disposed on the anti-escape plate 10 and the fourth connecting plate 901, and a telescopic rod 9022 disposed between the two ball joint components 9021; through the ball joint component 9021, the retractable connection 902 can adapt to the angle change of the anti-escape plate 10 during the sliding process, while the telescopic rod 9022 allows the connection to retract or extend in the length direction; Specifically, when the furnace door 2 is opened, the rotation of the furnace door 2 drives the third connecting plate 9 to rotate via a pin. The third connecting plate 9 then drives the fourth connecting plate 901 to move. The fourth connecting plate 901 pulls the anti-escape plate 10 through the retractable connecting part 902. During this process, the anti-escape plate 10 moves along the fixed rod 302 inside the furnace 3 towards the opening of the furnace 3 via the sliding groove 1001 on its side wall, gradually covering the internal space of the furnace 3. At the same time, the telescopic rod 9022 of the retractable connecting part 902 extends and retracts according to the movement trajectory of the anti-escape plate 10, and the ball joints 9021 at both ends allow the anti-escape plate 10 to move. The necessary angular deflection is generated to ensure smooth transmission of motion. When the furnace door 2 is opened, the anti-escape plate 10 slides along the fixed rod 302 to a predetermined position, which can physically isolate the air flow path between the inside and outside of the furnace chamber 3, effectively suppress the escape of high-temperature hot air at the moment the furnace door 2 is opened, reduce heat loss, and improve the operating environment. When the furnace door 2 is closed, the third connecting plate 9 and the fourth connecting plate 901 move in opposite directions. Through the shrinking connection part 902, the anti-escape plate 10 is pushed to slide and reset along the fixed rod 302 towards the inside and above of the furnace chamber 3 until the anti-escape plate 10 moves to a position that does not hinder the heating operation of the furnace chamber 3.

[0030] like Figure 2 , Figure 3 , Figure 5 , Figure 9 and Figure 10 As shown, in a preferred embodiment, based on the above method, the anti-escape plate 10 is further provided with a plurality of grooves 11 at equal intervals along its width direction. Each groove 11 is rotatably connected to a flip plate 111 through a rotating shaft. The rotating shaft is installed at one-third of the width direction of the flip plate 111. This non-central axis setting allows the flip plate 111 to generate a specific flipping torque when it is not under force. The side wall of the flip plate 111 and the inner wall of the groove 11 are provided with a mating inclined surface. The bottom of the tilting plate 111 is also fixed with a lifting rod 112 that moves against the inner wall of the bottom of the furnace 3; Specifically, when the second linkage component drives the anti-escape plate 10 to slide along the fixed rod 302 towards the bottom of the furnace 3 to isolate the air inside and outside the furnace 3, as the anti-escape plate 10 descends, the lifting rods 112 at the bottom of each flip plate 111 will contact the inner wall of the bottom of the furnace 3 and be subjected to an upward thrust. Under the action of this thrust, the flip plate 111 rotates around its axis until the side wall of the flip plate 111 and the abutting inclined surface of the inner wall of the groove 11 come into contact with each other, thereby closing each flip plate 111, filling the groove 11 on the anti-escape plate 10, forming a complete, gapless closed plate, effectively blocking the airflow. It should be noted here that... The sealing action of the anti-escape plate 10 should not obstruct the material feeding and unloading action on the placement rack 4. After the material is fed out, the anti-escape plate 10 will continue to move down and abut against the inner wall of the bottom of the furnace 3 to perform the sealing work. When the anti-escape plate 10 slides upward and resets along the fixed rod 302, the lifting rod 112 disengages from the contact with the inner wall of the bottom of the furnace 3, and the flip plate 111 loses its upward support force. At this time, the flip plate 111 rotates in the opposite direction around the rotating axis under its own gravity, so that the anti-escape plate 10 returns to the state with the groove 11, so as to avoid hindering the heat transfer in the furnace 3, reduce the interference with the temperature field in the furnace 3, and ensure heating efficiency.

[0031] like Figure 1 and Figure 11 As shown, in a preferred embodiment, based on the above method, an auxiliary heat preservation component is further provided on the outer wall of the furnace body 1 below the opening of the furnace chamber 3. The auxiliary heat preservation component includes a pneumatic shell 12 fixed on the outer side of the furnace body 1. A partition 121 for dividing the internal cavity of the pneumatic shell 12 into a gas collecting chamber and a gas venting chamber is fixed inside the pneumatic shell 12. A piston plate 122 is slidably connected inside the gas collecting chamber. A rubber sealing ring is provided on the outer side of the piston plate 122 to ensure sealing with the inner wall of the gas collecting chamber. A second elastic element 123 is provided between the piston plate 122 and the inner wall of the gas collecting chamber. A traction rope 124 is fixed on one side of the piston plate 122. The end of the traction rope 124 away from the piston plate 122 passes through the pneumatic shell 122. 2. It is fixedly connected to the furnace door 2. The top plate of the exhaust chamber has several exhaust holes 125 that are inclined towards the opening of the furnace chamber 3. The material of the traction rope 124 must meet the requirements of high temperature resistance, low creep, wear resistance and flexibility. It should be noted that in order to ensure the sealing performance of the traction rope 124 when it moves, a through hole is opened on the shell of the pneumatic shell 12 for the traction rope 124 to pass through. A stepped sealing chamber is set at the through hole. Flexible graphite packing or ceramic fiber rope can be filled in the stepped hole. The stuffing box structure achieves circumferential clamping of the flexible traction rope 124 through radial compression, which can ensure the airtightness of the piston plate 122 when it moves, and allow the linear reciprocating motion of the traction rope 124. One-way air inlet valves 126 are provided in both the gas collecting chamber and the gas exhaust chamber of the furnace body 1, which are used to control the direction of gas inflow. Specifically, when the furnace door 2 is opened, the furnace door 2 pulls the piston plate 122 via the traction rope 124 to slide to one side in the gas collection chamber against the elastic force of the second elastic element 123. At this time, the volume of the gas collection chamber decreases and the air pressure increases, and the air in the gas collection chamber enters the exhaust chamber through the one-way intake valve 126 on the partition plate 121, and is then extruded through the exhaust hole 125. Since the exhaust hole 125 is inclined toward the opening of the furnace chamber 3, the discharged air flow forms an air curtain toward the opening direction of the furnace door 2. This air curtain can effectively block the high-temperature air inside the furnace chamber 3 from escaping outward, while reducing the backflow of external cold air, significantly reducing the heat loss during the opening process of the furnace door 2, improving the operating environment, helping to shorten the time for the furnace chamber 3 to restore the set temperature after the furnace door 2 is closed, improving the test efficiency, and indirectly ensuring the accuracy and repeatability of the expansion ratio test data; when the furnace door 2 is closed, the pulling force of the traction rope 124 on the piston plate 122 disappears, and the piston plate 122 slides back in the reverse direction under the restoring force of the second elastic element 123. At this time, the gas collection chamber sucks air from the external environment through its corresponding one-way intake valve 126 to complete one working cycle. Through the repeated opening and closing of the furnace door 2 during the whole process, the alternate suction and discharge of gas are realized; the auxiliary heat preservation assembly is completely driven by the opening and closing action of the furnace door 2, via the pure mechanical structure of the traction rope 124 and the second elastic element 123, to drive the piston plate 122 to move back and forth, no additional electric power or complex control system is required, and with the control of the one-way intake valve 126, the directional flow and cyclic utilization of gas are realized; in addition, the blown cold air can quickly heat the air flow outside the crucible barrel 402, assist in cooling the thermally expanded sealing member to a certain extent, and allow the sample to reach a safe temperature that can be touched and measured faster; and the magnitude of its pneumatic pressure does not affect the entry and exit of the sample and the heat preservation work of the anti-escape plate 10.

[0032] Working principle: When the furnace door 2 is closed, the placement frame 4 is located at the heating position inside the furnace chamber 3; when the furnace door 2 is opened, the linkage mechanism automatically slides the placement frame 4 out of the furnace opening, and the crucible cup loaded with the test sample of the fire-resistant expansion sealing member to be tested is placed into the crucible barrel 402 on the placement frame 4; Push the furnace door 2 to close. During the closing process, the first linkage assembly automatically pushes the placement frame 4 back to the central heating area of the furnace chamber 3, and the grip 602 of the rotation locking assembly is rotated to make the baffle 603 snap into the limit plate 605; Set the target temperature and holding time on the control box 5, start heating, and the furnace chamber 3 begins to heat up. At this time, the anti-escape plate 10 is located at the upper part of the furnace chamber 3 and does not interfere with the heating; After reaching the set temperature and holding for the specified time, prepare for the test, slowly open the furnace door 2, and the following linkage actions occur at this time: Discharging: The rotation of the furnace door 2 drives the first linkage assembly to smoothly slide the placement frame 4 out of the furnace chamber 3 to the observation position; Sealing: When the furnace door 2 rotates, the second linkage component pulls the anti-escape plate 10 down to the bottom of the furnace chamber 3 along the fixed rod 302. Then the lifting rod 112 at the bottom of the anti-escape plate 10 contacts the bottom of the furnace chamber 3, forcing the flip plate 111 to rotate around the rotating shaft to a horizontal sealing state, separating the inside of the furnace chamber 3 from the outside of the furnace body 1. Air curtain: When the furnace door 2 is opened, the traction rope 124 is pulled, which drives the piston inside the pneumatic shell 12, and airflow is ejected from the exhaust port 125 to form an air curtain; After the placement rack 4 slides out, take out the sample from the crucible cup and pour it into the graduated cylinder to observe its volume, and then calculate its expansion ratio.

[0033] The following are the various operating states of each component: State 1: Standby and off state, furnace door 2 is closed, placement rack 4 is deep in furnace chamber 3, anti-escape plate 10 is located on the upper side inside furnace chamber 3, and pneumatic shell 12 is stationary; State 2: Open door discharge / discharge state, furnace door 2 is open, placement rack 4 moves outward, anti-escape plate 10 moves down to close the furnace opening 3, and air curtain sprays air; State 3: Sample taking / placing state, the placement rack 4 is located outside the furnace body 1, sample loading and unloading, and each structure maintains its limit position; State 4: Closed and reset state, furnace door 2 is closed, placement rack 4 moves inward, anti-escape plate 10 is reset, and pneumatic shell 12 is inlet.

[0034] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature expansion ratio testing device for fireproof expansion seals, comprising a furnace body (1), a furnace door (2) hinged to the outer wall of the furnace body (1), a furnace chamber (3) disposed within the furnace body (1), and a control box (5) connected to the furnace body (1), characterized in that, Also includes: The placement rack (4) is slidably disposed at the bottom of the furnace (3). The placement rack (4) includes a movable frame (401) and a crucible cylinder (402) movably supported on the movable frame (401). The first linkage component is connected between the furnace door (2) and the movable frame (401). When the furnace door (2) is opened, it drives the movable frame (401) to slide from the heating position inside the furnace (3) to the pick-up and put-down position outside the furnace (3), and drives the movable frame (401) to reset when the furnace door (2) is closed. The swinging loosening mechanism is set between the crucible cylinder (402) and the furnace (3) to drive the crucible cylinder (402) to swing and reset when the moving frame (401) slides. in, An anti-escape plate (10) is slidably installed inside the furnace (3); The second linkage component is connected between the furnace door (2) and the anti-escape plate (10). It is used to move the anti-escape plate (10) from the avoidance heating position to the closed position during the opening of the furnace door (2) so as to isolate the airflow communication between the inside of the furnace chamber (3) and the outside of the furnace body (1) when the placement rack (4) is in the pick-up and put-down position.

2. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 1, characterized in that, The furnace door (2) includes a door body (201) and a sealing block (202) fixed inside the door body (201) and matching the opening of the furnace chamber (3). Both the sealing block (202) and the furnace chamber (3) are made of fireproof bricks. A locking assembly is provided between the furnace door (2) and the furnace body (1). The locking assembly includes a U-shaped plate (6) fixed on the furnace door (2), a slide rod (601) slidably connected in the U-shaped plate (6), a handle (602) connected to one end of the slide rod (601), a baffle (603) connected to the other end of the slide rod (601), a first elastic element (604) sleeved on the outside of the slide rod (601) and abutting against the handle (602) and the U-shaped plate (6) at both ends respectively, and a limiting plate (605) fixed on the outside of the opening of the furnace body (1) and moving against the baffle (603).

3. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 2, characterized in that, The first linkage component includes a first connecting plate (7) and a second connecting plate (701). One end of the first connecting plate (7) is rotatably connected to the furnace door (2), and the other end of the first connecting plate (7) is rotatably connected to one end of the second connecting plate (701). The end of the second connecting plate (701) away from the first connecting plate (7) is rotatably connected to the placement rack (4).

4. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 3, characterized in that, The top of the movable frame (401) is provided with a conical groove, and the crucible cylinder (402) is movably supported in the conical groove by a connecting ball (403); The swing loosening mechanism includes a force rod (4021), a counterweight (8), and a stop rod (301); the force rod (4021) is connected to the bottom of the connecting ball (403), and the counterweight (8) is set on one side of the bottom of the crucible cylinder (402) so that the crucible cylinder (402) abuts against the inner wall of the conical groove when it is not pushed by the stop rod (301).

5. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 4, characterized in that, The baffle (301) is multiple, and the multiple baffles (301) are spaced apart at the bottom of the furnace (3) along the sliding direction of the movable frame (401), so that the force rod (4021) abuts against the multiple baffles (301) in sequence during the sliding process of the movable frame (401); When the movable frame (401) slides, the force rod (4021) abuts against the stop rod (301) and drives the crucible cylinder (402) to swing. After the force rod (4021) disengages from the stop rod (301), the counterweight (8) drives the crucible cylinder (402) to reset.

6. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 5, characterized in that, The second linkage component includes a third connecting plate (9), a fourth connecting plate (901), and a shrink connection part (902). One end of the third connecting plate (9) is rotatably connected to the furnace door (2), and the other end of the third connecting plate (9) is rotatably connected to the fourth connecting plate (901). The fourth connecting plate (901) is connected to the anti-escape plate (10) by a shrink connection part (902). The retractable connection (902) includes a ball joint component (9021) connected to the anti-escape plate (10) and the fourth connecting plate (901) respectively, and a telescopic rod (9022) connected between the two ball joint components (9021) to compensate for the angle and distance changes between the anti-escape plate (10) and the fourth connecting plate (901) during the sliding process.

7. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 6, characterized in that, A fixed rod (302) is provided inside the furnace (3), and a sliding groove (1001) is provided on the anti-escape plate (10) to slide in cooperation with the fixed rod (302). The anti-escape plate (10) can move back and forth along the fixed rod (302) between the avoidance heating position and the closed position.

8. The high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 7, characterized in that, The anti-escape plate (10) has multiple grooves (11), and each groove (11) is connected to a flip plate (111) by a rotating shaft. The rotating shaft is set off from the center of the width of the flip plate (111). A lifting rod (112) is connected below the flip plate (111). When the anti-escape plate (10) moves to the closed position, the lifting rod (112) abuts against the bottom of the furnace (3) and pushes the flip plate (111) to rotate to the position of the closed groove (11). When the anti-escape plate (10) returns to the position of avoiding heating, the lifting rod (112) disengages from the bottom of the furnace (3), and the flip plate (111) rotates to the position of the open groove (11) under its own weight.

9. A high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 8, characterized in that, An auxiliary heat preservation component is provided on the outer wall of the furnace body (1) below the opening of the furnace chamber (3). The auxiliary heat preservation component includes a pneumatic shell (12) fixed on the outside of the furnace body (1). A partition (121) for dividing the internal cavity of the pneumatic shell (12) into a gas collecting chamber and an exhaust chamber is fixed inside the pneumatic shell (12). A piston plate (122) is slidably connected inside the gas collecting chamber. A second elastic element (123) is provided between the piston plate (122) and the inner wall of the gas collecting chamber. A traction rope (124) is fixed on one side of the piston plate (122). The end of the traction rope (124) away from the piston plate (122) passes through the pneumatic shell (12) and is fixedly connected to the furnace door (2). The top plate of the exhaust chamber has several exhaust holes (125) that are inclined toward the opening of the furnace chamber (3). The furnace body (1) is equipped with a one-way air inlet valve (126) at both the gas collection chamber and the exhaust chamber to control the directional flow of gas.

10. A high-temperature expansion ratio testing device for fire-resistant expansion seals according to claim 9, characterized in that, The placement rack (4), the anti-escape plate (10), and all components in the first linkage assembly and the second linkage assembly are made of high-temperature resistant materials.

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